EP3039320B1

EP3039320B1 - Thermal management valve

Info

Publication number: EP3039320B1
Application number: EP14744980.5A
Authority: EP
Inventors: Matthew Peterson
Original assignee: Flextronics Automotive Inc
Current assignee: Flextronics Global Services Canada Inc Services G
Priority date: 2013-08-30
Filing date: 2014-06-18
Publication date: 2017-07-26
Anticipated expiration: 2034-06-18
Also published as: EP3039320A1; CN105723137A; CN105723137B; US10119620B2; CA2922866A1; ES2644445T3; US20150059897A1; CA2922866C; WO2015030906A1

Description

FIELD OF INVENTION

Embodiments of the present invention generally relate to fluid control valves. More particularly, embodiments of the present invention are related to a three port fluid control valve having two inputs on one outlet in which the valve can direct one of the two inputs to the outlet.

BACKGROUND

Some mechanical systems include a thermal management system to direct a fluid with a heat transfer capability to a heater or a cooler depending on a characteristic of the fluid, for example the fluid temperature. For example, some automotive transmission systems include a fluid control valve as a thermal management valve to selectively direct the flow of transmission oil from an oil cooler or an oil heater to a transmission oil reservoir, or sump. During initial transmission warm-up, the transmission oil from the transmission is directed to an oil heater to accelerate attaining optimum operating temperature conditions. At normal operating temperatures, the oil is directed to an oil cooler to maintain optimum operating temperature. A fluid control valve, sometimes referred to as a thermal management valve, is used to direct the flow from the oil heater or cooler to the sump depending on transmission operating conditions, for example transmission oil temperature.
Currently, thermal management valves use a wax motor to sense oil temperature and respond by actuating a thermal management valve. However, wax motors may be inaccurate, unreliable, and slow to react to operating conditions.
Three-way control valves used to do this have been described in DE 93 04 057 U1 , DE 20 2011 107875 , GB 2 320 311 A , and FR 2 353 777 A1 . Each of these patents discloses a three-way valve that allows for selective communication between various inlet passages and outlet passages.
Accordingly, a need exists for a thermal management valve that overcomes these shortcomings.

SUMMARY

Embodiments of a fluid control valve and a valve assembly including the fluid control valve are provided herein. According to the invention, the valve comprises the features of claim 1 and the valve assembly comprises the features of claim 10.

BRIEF DESCRIPTION OF THE DRAWINGS

Embodiments of the present invention, briefly summarized above and discussed in greater detail below, can be understood by reference to the illustrative embodiments of the invention depicted in the appended drawings. It is to be noted, however, that the appended drawings illustrate only typical embodiments of this invention and are therefore not to be considered limiting of its scope, for the invention may admit to other equally effective embodiments.

Figure 1A depicts a front sectional view of a fluid control valve in a first position in accordance with an embodiment of the present invention.
Figure 1B depicts a side sectional view of the valve of Figure 1A.
Figure 1C depicts a front sectional view of a fluid control valve in a second position in accordance with an embodiment of the present invention.
Figure 1D depicts a side sectional view of the valve of Figure 1C.
Figure 2A depicts a front sectional view of a fluid control valve assembly in a first position in accordance with an embodiment of the present invention.
Figure 2B depicts a side a side sectional view of the valve of Figure 2A.
Figure 2C depicts a front sectional view of a fluid control valve in a second position in accordance with an embodiment of the present invention.
Figure 2D depicts a side sectional view of the valve of Figure 2C.

To facilitate understanding, identical reference numerals have been used, where possible, to designate identical elements that are common in the figures. The figures are not drawn to scale and may be simplified for clarity. It is contemplated that elements and features of one embodiment may be beneficially incorporated in other embodiments without further recitation.
While described in reference to an automotive transmission fluid control valve, the present invention may be modified for a variety of applications while remaining within the scope of the claimed invention, since the range of the potential applications is great, and because it is intended that the present invention be adaptable to many such variations.

DETAILED DESCRIPTION

Figures 1A and 1B depict a non-limiting fluid control valve, valve 100, in accordance with an embodiment of the present invention in a first position. As shown in Figure 1A, the valve 100 has a first valve body 102 including a first inlet channel, inlet 104, formed through the side wall of the valve body 102 and a first cavity 106 in fluid communication with the first inlet 104. The first cavity 106 is formed through an upper surface 108 of the first valve body 102.
As illustrated in Figure 1B, the first valve body 102 includes outlet passages 110a and 110b, collectively outlet 110, formed through a lower surface 112 of the first valve body 102 and extending through the upper surface 108. Two passages 110a, 110b are illustrated, although one passage or a plurality passages may be used without departing from the scope of the invention.
A lower portion 114 of the first valve body 102 may be configured for coupling with, for example, a receiver such as a sump (not shown) or a conduit (not shown). The coupling may be a fluid-tight coupling, i.e., the coupling prevents, or substantially prevents, leakage of a fluid flowing in the valve 100 through the interface 118 during normal operating conditions for the valve 100. The configuration of the lower portion 114 may include internal or external threads, a snap fit detail to couple with the receiver, or other construction to facilitate the coupling.
In other embodiments, the outlet 110 may be formed through a side wall of the first valve body 102. The outlet 110 formed through a side wall may be arranged perpendicular to the first inlet 104, parallel to the first outlet, or at other orientations. The outlet 110 may be then coupled to a receiver or a conduit, as discussed above.
The upper portion 116 of the first valve body 102 is configured in a similar fashion to facilitate coupling to a bottom surface 126 of a second valve body 120. In some cases, the coupling between the bottom surface 126 of the second valve body 120 and the upper surface 108 of the first valve body 102 is a fluid-tight coupling. The second valve body 120 has second inlet channel, inlet 122, formed through a side wall of the second valve body 120 and a second cavity 124 formed through the bottom surface 126 such that the inlet 122 and the second cavity 124 are in fluid communication. A lip 128 is formed at the end of the second cavity 124 opposite the bottom surface 126.
Arranged with the second valve body 120 atop the first valve body 102 as illustrated in Figures 1A-1D, assembly of the valve 100 may beneficially be simpler and may facilitate sealing of the first and second valve bodies 102, 120.
In the exemplary embodiment illustrated, the second cavity 124 is radially larger than the first cavity 106. When the first and second valve bodies 102, 120 are coupled together, the outer wall 125 bounding the second cavity 124 is disposed outward from the outer wall 107 of the first cavity 106, forming a ledge 140.
As illustrated in Figures 1B and 1D, when the first valve body 102 and the second valve body 120 are coupled, the outlet 110, comprising passages 110a and 110b, are in fluid communication with the second cavity 124. For ease of illustration only, the outlet passages 110a and 110b are depicted between the outer wall 107 of the first cavity 106 and the outer side wall 103 of the first valve body. The passages 110a, 110b may be placed elsewhere within the first valve body 102. The fluid communication between the second cavity 124 and the outlet 110 is not affected by the position of the sealing element 134.
A valve member 130 including a valve stem 132 and a sealing element 134 disposed on a portion of the valve stem 132 is disposed within the first and second valve bodies 102, 120 and supported for displacement between at least a first valve position (Figures 1A and 1B) and a second valve position (Figures 1C and 1D). The sealing element 134 is disposed within the second cavity 124 and sized and shaped to selectably close the first inlet 104 or the second inlet 122 from fluid communication with the outlet 110 as discussed in greater detail below, thus providing selectable fluid communication between the outlet 110 and the first or second inlet 104, 122, respectively. For ease of illustration only, the sealing element 134 is depicted as a disk having upper and lower flat surfaces to contact the valve bodies in Figures 1A-1D. Other suitable shapes for the contact surfaces include, but are not limited to, conical and spherical surfaces.
In the first valve position (Figures 1A and 1B), the sealing element 134 abuts the lip 128 surrounding the second cavity 124, forming a plenum 138 bounded by the sealing element 134, the second cavity 124, and a portion of the upper surface 108. With the valve member positioned as illustrated in Figures 1A-1B, the second inlet 122 is closed to fluid communication with the outlet 110 and the first inlet 104 and the plenum 138 are open to fluid communication with the outlet 110. A resilient member 136, for example a spring, is provided to urge the valve stem 130 in the direction corresponding to the first valve position of Figures 1A, 1B.
In the second valve position (Figures 1C and 1D), the valve member 130 is displaced downwardly from the first position to abut the upper surface 108 of the first valve body around the perimeter of the first cavity 106, forming a plenum 138 as above. The second valve position places the sealing element 134 against the ledge 140. With the valve member 130 in the second valve position as illustrated in Figures 1C-1D, the first inlet 104 is closed to fluid communication with the outlet 110, and the second inlet 122 and the plenum 138 are open to fluid communication with the outlet 110.
Figures 2A-2D depict a non-limiting fluid control valve assembly, assembly 200, in accordance with an embodiment of the present invention. As shown in Figure 2A, the assembly 200 comprises the valve 100 as described above. In the embodiment illustrated, the valve 100 is coupled to an actuator. In the non-limiting embodiment illustrated, the actuator is a solenoid 202 having a movable armature 204 supported for linear displacement between at least the first position of Figures 2A, 2B and a second position of Figures 2C, 2D. The armature is coupled to the valve stem 132 via a pin 206 directly linked to the armature 204 and moving with the armature from a first position to a second position. The pin 206 abuts a portion of the valve member 130, for example the valve stem 132, such that the valve member 130 and the sealing element 134 are displaced in response to the displacement of the armature 204. For example, when the armature is in the first position of Figures 2A and 2B, the valve member 130 is in the corresponding first valve position. A resilient member 136, for example a spring, urges the valve stem 132 and the armature 204 into the first position. When the armature 204 is in the second position of Figures 2C and 2D, the valve stem 133 is displaced to the corresponding second valve position.
A coil 212 in the solenoid 202 is electrically coupled to a power source 208 controlled by a controller 210 for providing a selectable electrical signal, such as a current, to the coil 212 as illustrated in Figure 2B. The armature 204 is movable in response to a current applied to the coil 212. The controller 210 may provide at least a first electrical signal and a second electrical signal to the coil 212 corresponding to a first energy condition and a second energy condition, respectively. For example, the first electrical signal may be a 0 ampere current corresponding to a de-energized solenoid condition and the second electrical signal may correspond to a greater, or non-zero ampere, current corresponding to an energized solenoid condition. The first energy condition moves the armature to a first position corresponding to the first valve position and the second energy condition moves the armature to a second position corresponding to the second valve position.
Thus a fluid control valve and a fluid control valve assembly are provided herein. The inventive fluid control valve and assembly advantageously provides a reliable, accurate, and responsive thermal management valve that may improve the performance of a mechanical system, such as an automotive transmission.
Those of ordinary skill in the art may recognize that many modification and variations of the above may be implemented without departing from the scope of the following claims. For example, although reference to an automotive transmission is made, other mechanical systems sensitive to thermal conditions for optimum performance may benefit from the disclosed fluid control valve and valve system.

Claims

A fluid control valve (100), comprising:
a first valve body (102) including an outlet (110), a first inlet (104), and a first cavity (106) formed through an upper surface (108) in fluid communication with the first inlet (104);

a second valve body (120) having a bottom surface (126) disposed on and coupled in a fluid-tight manner to the upper surface (108), the second valve body (120) including a second inlet (122) and a second cavity (124) having a lip (128), the second cavity (124) formed through the bottom surface (126) and in selectable communication with the second inlet (122); and

a valve member (130), including a sealing element (134) disposed on a portion of a valve stem (132), supported within the first and second valve bodies (102, 120) for displacement between at least a first valve position and a second valve position,

wherein the outlet (110) is in selectable fluid communication with the first inlet (104) and the second inlet (122) and comprises a plurality of passages (110a, 110b).
The fluid control valve (100) of claim 1, wherein the first valve position opens the outlet to fluid communication with the first inlet (104) and closes the outlet (110) to fluid communication with the second inlet (122), and the second valve position opens the outlet (110) to fluid communication with the second inlet (122) and closes the outlet (110) to fluid communication with the first inlet (104).
The fluid control valve (100) of claim 1, wherein a resilient member (136) urges the valve member (130) in a direction corresponding to the first valve position.
The fluid control valve (100) of claim 1, wherein
a portion of the second cavity (124), the sealing element (134), and the upper surface (108) of the first valve body (102) forms a plenum (138) open to the first inlet (104) and the outlet (110) in the first valve position; or
the second cavity (124), the sealing element (134), and a portion of the upper surface (108) of the first valve body (102) forms the plenum (138) open to the second inlet (122) and the outlet (110) in the second valve position.
The fluid control valve (100) of claim 1, wherein the sealing element (134) is disposed in the second cavity (124) such that the first valve position places the sealing element (134) against the lip (128) and the second valve position places the sealing element (134) against a ledge (140) formed between an outer wall (125) of the second cavity (124) and an outer wall (107) of the first cavity (106).
The fluid control valve (100) of claim 1, wherein the plurality of passages of the outlet (110a, 110b) is formed through the first valve body (102) from a lower surface (112) to the upper surface (108).
The fluid control valve of claim 6 (100), wherein the plurality of passages of the outlet (110a, 110b) are in fluid communication with the second cavity (124) when the upper surface (108) of the first valve body (102) and the bottom surface (126) of the second valve body (120) are in the abutting fluid-tight arrangement.
The fluid control valve (100) of claim 6, wherein the plurality of passages of the outlet (110a, 110b) are formed adjacent to the first cavity (106) and an outer side wall (103).
The fluid control valve (100) of claim 6, wherein the lower portion (114) of the first valve body (102) is configured for fluid-tight coupling to a receiver.
A fluid control valve assembly (200), comprising:
a first valve body (102) including an outlet (110), a first inlet (104), and a first cavity (106) formed through an upper surface (108), the first cavity (106) in fluid communication with the first inlet (104);

a second valve body (120) having a bottom surface (126) disposed on and coupled in a fluid-tight manner to the upper surface (108), the second valve body (120) including a second inlet (122) and a second cavity (124) having a lip (128), the second cavity (124) formed through the bottom surface (126) and in selectable communication with the second inlet (122);

an actuator (202) having a movable armature (204) supported for linear displacement between at least a first position and a second position; and

a valve member (130) including a sealing element (134) disposed on a portion of a valve stem (132), the valve stem (132) coupled to the armature (204) and supported within the first and second valve bodies (102, 120) for displacement between at least a first valve position and a second valve position in response to the linear displacement of the armature (204),

wherein the outlet (110) is in selectable fluid communication with the first inlet (104) and the second inlet (122) and comprises a plurality of passages (110a, 110b).
The fluid control valve assembly (200) of claim 10 wherein a resilient element (136) urges the movable armature (204) in a direction corresponding to the first position.
The fluid control valve assembly (200) of claim 10, wherein the first valve position opens the outlet (110) to fluid communication with the first inlet (104) and closes the outlet (110) to fluid communication with the second inlet (122), and the second valve position opens the outlet (110) to fluid communication with the second inlet (122) and closes the outlet (110) to fluid communication with the first inlet (104).
The fluid control valve assembly (200) of claim 10, wherein
a portion of the second cavity (124), the sealing element (134), and the upper surface (108) of the first valve body (102) forms a plenum (138) open to the first inlet (104) and the outlet (110) in the first valve position; or
the second cavity (124), the sealing element (134), and the upper surface (108) of the first valve body (102) forms a plenum (138) open to the second inlet (122) and the outlet (110) in the second valve position.
The fluid control valve assembly (200) of claim 10 wherein the actuator (202) is a solenoid (202) having
a coil (212) wherein the armature (204) is movable in response to an electrical current applied to the coil (212); or
a coil (212) wherein the armature (204) is movable in response to an electrical current applied to the coil (212), wherein the armature (204) is coupled to the valve stem (132) via a pin (206) directly linked to the armature (204) and abutting a portion of the valve member (130).
The fluid control valve assembly (200) of claim 14, wherein the first position corresponds to a first energy condition and the second position corresponds to a second energy condition; or
a first position corresponds to a first energy condition, wherein the first energy condition corresponds to a first current applied to the coil (212), and a second position corresponds to a second energy condition, wherein the second energy condition corresponds to a second current applied to the coil (212); or
a first position corresponds to a first energy condition, wherein the first energy condition corresponds to a first current applied to the coil (212) and the first current is a 0 ampere current, and a second position corresponds to a second energy condition; wherein the second energy condition corresponds to a second current applied to the coil (212) and the second current is greater than the first current.